This is the least expensive unit of its kind on the market today. This portable psychrometer indicates wet and dry bulb temperatures for relative humidity and dewpoint determinations. Housed in a high-impact case, the unit consists of a pair of matched thermometers, magnetic fan motor, plastic water bottle, illuminating lamp, psychrometric slide rule, spare parts kit and manual. No whirling of the instrument is required to obtain readings. A miniature fan provides constant air motion over the thermometers. Humidity is determined from the psychrometric tables included with the instrument. Three "D" cell batteries supply about 1000 operations. Psychro-Dyne Manual
